Posted by student on Tuesday, July 27, 2010 at 10:06pm.
Let Q be an acute angle such that sinQ=.6. Find the values of the following using Trig Identities: cosQ and tanQ
trig - rick, Tuesday, July 27, 2010 at 10:12pm
sin^-1(.6) = 36.8 degrees
cos36.8 = .80
tan36.8 = .748
trig - Reiny, Tuesday, July 27, 2010 at 10:17pm
They probably wanted exact values without using a calculator.
given sinQ = .6 = 6/10 or 3/5
so Q is in a right angled triangle with opposite side of 3 and hypotenuse of 5.
You should recognize the famous 3-4-5 right-angled triangle.
cosQ = 4/5 or .8
tanQ = 3/4 or .75
these values are "exact"
trig - bobpursley, Tuesday, July 27, 2010 at 10:17pm
You can do it this way:
sin^2 + cos^2=1
solve for cosTheta.
Then finally, tanTheta= sinTheta/CosTheta
trig - student, Tuesday, July 27, 2010 at 10:18pm
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